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Campaigner Sir Ranulph Fiennes has accused Theresa May of being "disingenuous" over the Conservative Party's plan to hold another vote on ending the foxhunting ban.

Citing Mrs May's pledge to tackle modern slavery, Sir Fiennes said in an interview on Peston on Sunday: "She is being inconsistent...to encourage the reemergence of another abuse which we definitely thought had been confined to the history books, which is without a doubt 'a cruel exploitation'."

The explorer added that he has seen first-hand the results of foxhunting.

"To go out on horseback, jumping over fences etc is great, I encourage it," he said.

Veteran explorer Sir Ranulph Fiennes will take on "the toughest footrace on Earth" in April - the Marathon des Sables in Morocco - in a bid to raise millions for charity and become the oldest Briton ever to complete the race.

Sir Ranulph, who turns 71 in March, must run 156 miles across the Sahara in 50C heat to complete the six-day ultramarathon.

He hopes to raise £2.5 million for Marie Curie, which provides care and support to terminally ill people and their families across the UK.

Relative to some of the other things, this will take less time to train for - it will only take six or seven months of running five days a week.

Sir Ranulph Fiennes says he has been left "frustrated" at being forced to pull out of an Antarctica expedition because of frostbite. The adventurer was injured after a fall at a base camp and developed frostbite after taking off his outer gloves in temperatures of -33 celsius.

Speaking after arriving back in the UK, Fiennes explained how the expedition had been five years in the planning.

Prince Charles has given his royal seal of approval to the Ice Team before they embarked upon their mission to walk across Antarctica during the coldest time of the year. The Prince of Wales is the patron of the Antarctic Winter Crossing Expedition 2012.

Prince Charles with Sir Ranulph Fiennes Credit: Lewis Whyld/PA Wire

His Royal Highness spoke to members of the expedition Credit: Lewis Whyld/PA Wire

A large crowd gathered for a chance to meet the Prince of Wales Credit: Lewis Whyld/PA Wire

The world's greatest living explorer, Sir Ranulph Fiennes, is receiving a royal send off from Prince Charles as he begins his latest record breaking challenge. He's attempting to become the first person to cross the Antarctic on foot during winter.

The expedition will take place in temperatures as low as -70C, much of it in total darkness. Our Science Editor Lawrence McGinty has been to meet him.